J. Anim Sci.
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J. Anim Sci. 1971. 32:496-499.
© 1971 American Society of Animal Science
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Effect of Homogenized Embryos on Iud-Induced Luteal Regression in the Ewe1

J. E. Warren, Jr.2, H. W. Hawk3 and W. F. Williams2

University of Maryland 20740 and U. S. Department of Agriculture 20705

Abstract

A plastic spiral (IUD) inserted into a uterine horn adjacent to an ovary containing a corpus luteum (CL) induced precocious CL regression if inserted on day 3 of the estrous cycle but not if inserted on day 4, 5 or 6. Homogenized 14- or 15-day-old embryos injected into the uterus at the time an IUD was inserted did not prevent CL regression. It was subsequently determined that the IUD had to remain in the uterine horn for longer than one day to induce CL regression.

The uteri of 14 ewes were then fitted on day 3 with an IUD and a cannula and the uterus infused on days 3, 4 and 5 with saline solution or with saline solution containing two homogenized embryos. Corpora lutea were maintained in four of seven embryo-infused ewes and in none of seven saline-infused ewes (P<.05); the results suggest that embryos can sometimes prevent IUD-induced CL regression.

Footnotes

1 Scientific Article No. A 1622 Contribution No. 4348 of the Maryland Agricultural Experiment Station, Department of Dairy Science. This work was done at the Agricultural Research Center. Beltsville. Maryland, under a cooperative agreement between the U.S.D.A. and the University of Maryland.

2 Department of Dairy Science. University of Maryland, College Park 20740.

3 Animal Husbandry Research Division, A.R.S., U.S.D.A., Beltsville, Maryland 20705.






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Copyright © 1971 by the American Society of Animal Science.